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Kelly Services is taking a staged approach to replacing legacy PBXs with a Microsoft-provided hosted UC service. It is an ambitious undertaking given the newness of the Cloud PBX and PSTN Calling functionality and its limited geographical availability at present. But Kelly can modify its strategy as the Microsoft services mature and evolve.


  • Microsoft has evolved its hosted instant messaging service to be a viable PBX replacement and is targeting large enterprises as its first customers.
  • Kelly Services is among the first to embrace the new offering and start to rely on it for corporate communications.

Features and Benefits

  • Evaluates Kelly Services' use of Office 365 and Skype for Business Online as a corporate communications service.
  • Identifies how large enterprises are examining and adopting Microsoft services for unified communications.

Key questions answered

  • How are large enterprises examining and adopting the new Cloud PBX and PSTN Calling functionality in Skype for Business Online?
  • How has Microsoft evolved its UC services to provide a more complete set of enterprise communications and collaboration capabilities?

Table of contents


  • In brief
  • Ovum view
  • Recommendations

MNC sees Office 365 as a viable option for PBX replacement

  • Standardizing on Skype for Business Online for messaging
  • Gradual move to cloud communications and a single provider
  • Standardizing on Skype for Business Online for business telephony
  • The importance of a well-designed network


  • Methodology
  • Further reading
  • Author

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